Before 1958, Babe Ruth had the highest wRC+ in a season, with 237 wRC+ in 1920.

Interpreted as:

most single season wrc+ with a minimum of 3.1 PA per team game by a player until 1957

	NAME	WRC+	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	BRAA
1	Babe Ruth B. Ruth	237	1920	NYY	142	458	158	172	36	9	54	135	150	3	80	14	14	616	388	99	5				.376	.532	.847	1.379	191	120.9	.597	110.5
2	Babe Ruth B. Ruth	230	1923	NYY	152	522	151	205	45	13	41	130	170	4	93	17	21	699	399	99	3				.393	.545	.764	1.309	211	124.7	.571	120.4
3	Babe Ruth B. Ruth	224	1921	NYY	152	540	177	204	44	16	59	168	145	4	81	17	13	693	457	119	4				.378	.512	.846	1.359	214	127.8	.575	118.7
4	Ted Williams T. Williams	223	1957	BOS	132	420	96	163	28	1	38	87	119	5	43	0	1	546	307	67	0	2	33	11	.388	.526	.731	1.257	148	87.3	.524	79
5	Ted Williams T. Williams	221	1941	BSA	143	456	135	185	33	3	37	120	147	3	27	2	4	606	335	73	0			10	.406	.553	.735	1.287	179	108.8	.568	96.9
6	Rogers Hornsby R. Hornsby	221	1924	SLN	143	536	121	227	43	14	25	94	89	2	32	5	12	640	373	82	13				.424	.507	.696	1.203	175	96.7	.537	95.9
7	Mickey Mantle M. Mantle	217	1957	NYY	144	474	121	173	28	6	34	94	146	0	75	16	3	623	315	68	0	3	23	5	.365	.512	.665	1.177	157	87.1	.498	86
8	Babe Ruth B. Ruth	216	1926	NYY	152	495	139	184	30	5	47	153	144	3	76	11	9	652	365	82	10				.372	.516	.737	1.253	184	105.6	.551	100.6
9	Fred Dunlap F. Dunlap	215	1884	SLU	101	449	160	185	39	8	13		29					478	279	60					.412		.621		143	73.6	.477	77.7
10	Ted Williams T. Williams	214	1946	BSA	150	514	142	176	37	8	38	123	156	2	44	0	0	672	343	83	0			12	.342	.497	.667	1.164	166	95.8	.525	87.5
11	Babe Ruth B. Ruth	212	1927	NYY	151	540	158	192	29	8	60	165	137	0	89	7	6	691	417	97	14				.356	.486	.772	1.258	195	109.9	.545	104.8
12	Babe Ruth B. Ruth	210	1924	NYY	153	529	143	200	39	7	46	124	142	4	81	9	13	681	391	92	6				.378	.513	.739	1.252	193	109.2	.549	102
13	Lou Gehrig L. Gehrig	209	1927	NYY	155	584	149	218	52	18	47	173	109	3	84	10	8	717	447	117	21				.373	.474	.765	1.240	199	110.9	.540	105.6
14	Ted Williams T. Williams	209	1942	BSA	150	522	141	186	34	5	36	137	145	4	51	3	2	671	338	75	0			12	.356	.499	.648	1.147	168	96.2	.524	86.5
15	Rogers Hornsby R. Hornsby	208	1925	SLN	138	504	133	203	41	10	39	143	83	2	39	5	3	605	381	90	16				.403	.489	.756	1.245	173	94.1	.540	90.1
16	Ted Williams T. Williams	207	1954	BOS	117	386	93	133	23	1	29	89	136	1	32	0	0	526	245	53	0	3		10	.345	.513	.635	1.148	131	71.1	.507	65.5
17	Ted Williams T. Williams	207	1947	BSA	156	528	125	181	40	9	32	114	162	2	47	0	1	693	335	81	1			10	.343	.499	.634	1.133	170	91.3	.508	86.2
18	Babe Ruth B. Ruth	206	1931	NYY	145	534	149	199	31	3	46	162	128	1	51	5	4	663	374	80	0				.373	.495	.700	1.195	181	98.6	.525	95.1
19	Ty Cobb T. Cobb	206	1910	DET	140	506	106	194	35	13	8	91	64	4	46	65		590	279	56	16				.383	.456	.551	1.008	126	64.9	.481	63.4
20	Babe Ruth B. Ruth	204	1930	NYY	145	518	150	186	28	9	49	153	136	1	61	10	10	676	379	86	21				.359	.493	.732	1.225	192	97	.517	100.6
21	Babe Ruth B. Ruth	203	1919	BSA	130	432	103	139	34	12	29	113	101	6	58	7		542	284	75	3				.322	.456	.657	1.114	127	70.9	.509	65.5
22	Mickey Mantle M. Mantle	202	1956	NYY	150	533	132	188	22	5	52	130	112	2	99	10	1	652	376	79	1	4	6	4	.353	.464	.705	1.169	164	88.9	.498	84.6
23	Stan Musial S. Musial	201	1948	SLN	155	611	135	230	46	18	39	131	79	3	34	7		694	429	103	1			18	.376	.450	.702	1.152	174	92.3	.512	86.4
24	Babe Ruth B. Ruth	201	1928	NYY	154	536	163	173	29	8	54	146	137	3	87	4	5	684	380	91	8				.323	.463	.709	1.172	174	90.6	.510	89.3
25	Ty Cobb T. Cobb	200	1917	DET	152	588	107	225	44	24	6	102	61	4	34	55		669	335	74	16				.383	.444	.570	1.014	139	74.2	.480	69